O=[C:2]([NH:15]/[N:16]=[C:17]1\[NH:18][C:19](=[O:31])[C:20]2[NH:21][CH:22]=[N:23][C:24]=2[N:25]\1[CH2:26][CH2:27][CH2:28][CH2:29][CH3:30])[CH2:3][NH:4][C:5](=[O:14])[O:6][CH2:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1>C1(C)C=CC=CC=1>[O:31]=[C:19]1[N:18]2[C:2]([CH2:3][NH:4][C:5](=[O:14])[O:6][CH2:7][C:8]3[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=3)=[N:15][N:16]=[C:17]2[N:25]([CH2:26][CH2:27][CH2:28][CH2:29][CH3:30])[C:24]2[N:23]=[CH:22][NH:21][C:20]1=2The solution of benzyl 2-oxo-2-[(2E)-2-(6-oxo-3-pentyl-1,3,6,7-tetrahydro-2H-purin-2-ylidene)hydrazino]ethylcarbamate (0.60 g, 0.84 mmol) in toluene (30 mL) was refluxed overnight. M+H=410.1. The product was precipitated from the reaction mixture and filtered to give the desired product (300 mg, 87%). LCMS calculated for C20H24N7O3(M+H): 410.2; found: 410.2.
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